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/*===========================================================================
Copyright (C) 2001 European Southern Observatory (ESO)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 675 Massachusetss Ave, Cambridge,
MA 02139, USA.
Corresponding concerning ESO-MIDAS should be addressed as follows:
Internet e-mail: midas@eso.org
Postal address: European Southern Observatory
Data Management Division
Karl-Schwarzschild-Strasse 2
D 85748 Garching bei Muenchen
GERMANY
===========================================================================*/
/*-------------------------------------------------------------------------*/
/**
* @defgroup flames_computeback Substep: Compute background frame
*
*/
/*-------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------
Includes
--------------------------------------------------------------------------*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <flames_midas_def.h>
#include <flames_uves.h>
#include <flames_newmatrix.h>
#include <flames_computeback.h>
#include <uves_msg.h>
#include <math.h>
#include <stdio.h>
/**@{*/
/*---------------------------------------------------------------------------
Implementation
---------------------------------------------------------------------------*/
/**
@name flames_computeback()
@short Compute background frame
@author G. Mulas - ITAL_FLAMES Consortium. Ported to CPL by A. Modigliani
@param Frame input frame
@param backframe output background frame
@return success or failure code
DRS Functions called:
dmatrix
Pseudocode: computes background frame corresponding to determined x,y degrees
@note
*/
flames_err computeback(flames_frame *Frame, frame_data **backframe)
{
int i=0,j=0,k=0,l=0,m=0;
/* use some buffers to speed up the calculation of coordinate powers */
double **xpowers, **ypowers;
double *xbuf, *xbuf1, *ybuf, *ybuf1;
double xscale, yscale;
frame_data *fdbuf, fdbuf1;
double dbuf1, dbuf2;
uves_msg_debug("computeback 0");
uves_msg_debug("xdeg=%d subcols=%d\n",Frame->back.xdegree, Frame->subcols);
xpowers = dmatrix(1, Frame->back.xdegree, 1, Frame->subcols);
uves_msg_debug("computeback 01");
ypowers = dmatrix(1, Frame->back.ydegree, 1, Frame->subrows);
xscale = Frame->subcols>=2 ? (double)Frame->subcols-1 : 1;
yscale = Frame->subrows>=2 ? (double)Frame->subrows-1 : 1;
int32_t npar = (int32_t)(Frame->back.xdegree+1)*(Frame->back.ydegree+1);
/* set up the buffers now */
xbuf1 = xpowers[1];
ybuf1 = ypowers[1];
for (i=0; i<=(Frame->subrows-1); i++) ybuf1[i] = ((double) i)/yscale;
for (j=0; j<=(Frame->subcols-1); j++) xbuf1[j] = ((double) j)/xscale;
for (k=2; k<=Frame->back.ydegree; k++) {
ybuf = ypowers[k];
double* ybuf2 = ypowers[k-1];
for (i=0; i<=(Frame->subrows-1); i++) ybuf[i] = ybuf1[i]*ybuf2[i];
}
for (k=2; k<=Frame->back.xdegree; k++) {
xbuf = xpowers[k];
double* xbuf2 = xpowers[k-1];
for (j=0; j<=(Frame->subcols-1); j++) xbuf[j] = xbuf1[j]*xbuf2[j];
}
/* compute the fitted points */
/* xdeg = ydeg = 0 */
fdbuf1 = (frame_data) Frame->back.coeff[1];
for (i=0; i<=(Frame->subrows-1); i++) {
fdbuf = backframe[i];
for (j=0; j<=(Frame->subcols-1); j++) {
fdbuf[j] = fdbuf1;
}
}
m=1;
for (l=1; l<=Frame->back.xdegree; l++) {
/* ydeg = 0, xdeg>0 */
m++;
xbuf = xpowers[l];
dbuf1 = Frame->back.coeff[m];
for (i=0; i<=(Frame->subrows-1); i++) {
fdbuf = backframe[i];
for (j=0; j<=(Frame->subcols-1); j++) {
fdbuf[j] += (frame_data) (dbuf1*xbuf[j]);
}
}
}
for (k=1; k<=Frame->back.ydegree; k++) {
/* ydeg > 0, xdeg=0 */
m++;
ybuf = ypowers[k];
dbuf1 = Frame->back.coeff[m];
for (i=0; i<=(Frame->subrows-1); i++) {
fdbuf = backframe[i];
fdbuf1 = (frame_data) (dbuf1*ybuf[i]);
for (j=0; j<=(Frame->subcols-1); j++) {
fdbuf[j] += fdbuf1;
}
}
/* ydeg > 0, xdeg>0 */
for (l=1; l<=Frame->back.xdegree; l++) {
m++;
xbuf = xpowers[l];
dbuf1 = Frame->back.coeff[m];
for (i=0; i<=(Frame->subrows-1); i++) {
fdbuf = backframe[i];
dbuf2 = dbuf1*ybuf[i];
for (j=0; j<=(Frame->subcols-1); j++) {
fdbuf[j] += (frame_data) (dbuf2*xbuf[j]);
}
}
}
}
/* free local temporary buffers */
free_dmatrix(xpowers, 1, Frame->back.xdegree, 1, Frame->subcols);
free_dmatrix(ypowers, 1, Frame->back.ydegree, 1, Frame->subrows);
return NOERR;
}
/**@}*/
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